윈도우 버전 알아보기

int GetWindowsType(void)
{
	/*
	return value :
	-1 : 버전얻기 실패
	1 : Windows 95,
	2 : Windows 98,
	3 : Windows ME,
	4 : Windows NT,
	5 : Windows 2000,
	6 : Windows XP,
	7 : Windows 2003,
	8 : Windows Vista, 2008
	9 : Windows 7, 2008 R2
	10: Windows 10,
	*/

	int nVersion = -1;
	OSVERSIONINFOEX osvi = { 0, };
	BOOL version_ex_flag = 0;

	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

	if (!(version_ex_flag = GetVersionEx((OSVERSIONINFO *)&osvi)))
	{
		osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
		if (!GetVersionEx((OSVERSIONINFO *)&osvi))
			return -1;
	}

	switch (osvi.dwPlatformId)
	{
	case VER_PLATFORM_WIN32_WINDOWS:    // 윈도우즈 9x 기반의 운영체제인 경우
	{
		if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 0)
		{
			nVersion = 1;           // Windows 95
		}
		else if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 10)
		{
			nVersion = 2;           // Windows 98
		}
		else if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)
		{
			nVersion = 3;           // Windows ME
		}
	}
	break;
	case VER_PLATFORM_WIN32_NT: // NT 기술 기반의 운영체제인 경우
	{
		if (osvi.dwMajorVersion <= 4)
		{
			nVersion = 4;           // Windows NT
		}
		else if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0)
		{
			nVersion = 5;           //Windows 2000
		}
		else if (version_ex_flag)
		{
			if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1)
			{
				nVersion = 6;       // Windows XP
			}
			else if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2)
			{
				nVersion = 7;       // Windows 2003
			}
			else if (osvi.dwMajorVersion == 6 && osvi.dwMinorVersion == 0)
			{
				nVersion = 8;       // Windows Vista, 2008
			}
			else if (osvi.dwMajorVersion == 6 && osvi.dwMinorVersion == 1)
			{
				nVersion = 9;       // Windows7, 2008 R2
			}
			else if (osvi.dwMajorVersion == 6 && osvi.dwMinorVersion == 2)
			{
				nVersion = 10;		// Windows10
			}
		}
	}
	break;
	}
	return nVersion;
}